Advanced Custom Fields

acf-image.php

<?php 

    $imageID = get_field('image_field_name'); // set this field to return Image ID
    $size  = 'full'; // thumbnail, medium, large, full

    $img = wp_get_attachment_image_src( $imageID, $size );
    
    if( !empty($image) ):
        $url = $img[0];
        $width = $img[1];
        $style = 'max-width:'.$width.'px';
        
        ?><img src="<?php echo $url ?>" style="<?php echo $style ?>"><?php
    endif;

?>

acf-options-page.php

<?php

acf_add_options_page(array(
	'page_title' 	=> 'Theme Settings',
	'menu_title'	=> 'Theme Settings',
	'menu_slug' 	=> 'theme-settings',
	'capability'	=> 'edit_posts',
	'redirect'		=> false
));
	
?>

acf-repeater.php

<?php
    if( have_rows('repeater_field_name') ):
        while( have_rows('repeater_field_name') ):

            echo get_sub_field('sub_field_name');

        endwhile;
    endif;
?>